Acropolis, Hall of Learning

(This City starts with TWELVE defense counters. It can be attacked and defended like a planeswalker. Whenever a creature deals damage to it, remove that many defense counters. Once it has no defense counters on it, the controller of the creature that last attacked it gains control of it, and it regains its defense counters.)
{w}{u}, {t}: Scry 2, then draw a card.